If the mods password is set. Editing place holder text in any rooms will results in that particular room cannot scroll back to previous history. That button will disappear. It might be resolved spontaneously by time, or changing the mods password, or reverse the placeholder text.
Ah thanks there was one other place I forgot to apply the fix - should be all good now but let me know if not.
Thank you dev, it seems all nice and good! 👍